Postfix Issue

Hello all, I finally had to register rather than reading the threads because I came across an issue that I cannot figure out.

Here is what I have...

Fedora Core 5, running ispconfig with postfix and spamassassin (spamassassin is not very well configured due to lack of time so it really isnt doing anything as of yet). This has been running for several weeks without a single hitch. Until this morning. It seems as though incoming email is getting lost somewhere, but I cannot find where it is going. I have another mail server and I can read in the logs where mail is being delivered to the postfix server, but when users check their mail, there is nothing there. There is no problems with logging into their mail accounts, everything seems fine. Just no mail.

Anyone encounter a similar issue? And have some information on where I should take it from here?

Yes, I just checked it.. The mail log is pretty long.. Is there anything in particular I should look for? I do notice a line saying "Cannot Load Certificate Authority Data" could this be a certificate issue?

There is also this line..... comes up every so often in the log.
warning: TLS library problem: 3143:error:2006D080:BIO routines:BIO_new_file:no such file:bss_file.c:125:

It is possible that is the problem, I am not doing the DNS forwarding for this domain. It is done at the isp's DNS server. However, I would think that the mail would come back as undeliverable. But, it doesn't.

The website that is running on this domain is still working just fine. So, I am inclined to think that it is not a forwarding issue. But, it certainly could be. Just to be sure I will call the isp and see if they are forwarding port 25 to the proper public address.

Good thought, but not the issue, I have another mail server running on a windows machine that is using the same connection (different public IP) and is still working properly. I put this server together to learn more about linux and thought I had done pretty good until this popped up..

Well, I did this.. what I saw was "unknown local recipient" error and an error saying "TLS Library problem".. So, I removed the "test" domain in ISPconfig and sent another mail to the server. It came through. So, something was messed up. No idea what or why but it seems to be working properly now. Thank you very much for your suggestions.